{"tool":"navamsa-chart-calculator","title":"Navamsa (D9) Chart Calculator","summary":"Maps the nine planets and the ascendant into the sidereal Navamsa (D9) chart, with vargottama detection. Birth time required.","calculation_version":"1.0.0","methodology_url":"https://vedara.me/tools/navamsa-chart-calculator#methodology","operationId":"calculate_navamsa_chart_calculator","input_schema":{"type":"object","required":["birth_date","birth_time","latitude","longitude"],"additionalProperties":false,"properties":{"birth_date":{"type":"string","pattern":"^\\d{4}-\\d{2}-\\d{2}$","description":"ISO 8601 date (YYYY-MM-DD)","example":"1990-06-15"},"birth_time":{"type":"string","pattern":"^\\d{2}:\\d{2}$","description":"Local 24h time HH:MM. Required; the navamsa ascendant is time-sensitive.","example":"09:00"},"birth_timezone":{"type":"string","description":"IANA timezone id","example":"Asia/Kolkata"},"latitude":{"type":"number","minimum":-90,"maximum":90,"example":28.6139},"longitude":{"type":"number","minimum":-180,"maximum":180,"example":77.209}}},"example_request":{"birth_date":"1990-06-15","birth_time":"09:00","birth_timezone":"Asia/Kolkata","latitude":28.6139,"longitude":77.209},"disclaimer":"Traditional Vedic framework for reflection, not a prediction or professional advice."}